If the price has fallen by 10% what percent of its consumption be: increased so that the expenditure may be the same as before?

11 1/9 %

NA

Solution:

Let Rs.100 be the price and the consumption be 100 units so the expenditure would be Rs.100.

Price is decreased by 10%, so the new price is Rs. 90 and the consumption would be 90 units and the expenditure would be Rs.90.

Now the percentage of increase in consumption so that the expenditure remains constant is,

= (10/90)×100

= 100/9

= 11⅑ %

So, the correct option is C). 11⅑ %